...now that everything's been explained, let the mayhem ensue!
The box office success of this film resulted in Hammer launching both a series of Frankenstein sequels and a slew of other monsters in their own films.
Some like Dracula and The Mummy proved to have staying power and spawned their own ongoing series.
(Frankenstein had six, Dracula had eight, The Mummy had three)
Others like The Werewolf and Phantom of the Opera had only one film each.
Unlike the Universal Horror series, there was never a Hammer crossover film involving two or more monsters!